A signal generating device includes a digital signal processing unit, M sub DACs of which an analog bandwidth is fB, M being an integer equal to or greater than 2, a broadband analog signal generating unit configured to generate a broadband analog signal that includes a component of a frequency of (M-1)fB or more by using M analog signals output from the M sub DACs. The digital signal processing unit includes components for generating M original divided signals that correspond to signals obtained by dividing a desired output signal into M portions on a frequency axis and down-converting the portions to the baseband, components for generating M folded divided signals by folding back the M original divided signals on the frequency axis, and a 2M×M filter that takes the original divided signals and the folded divided signals as inputs and outputs M composite signals to be transmitted to the M sub DACs. The 2M×M filter can set a response function independently for each of 2M2 combinations of input and output.
Legal claims defining the scope of protection, as filed with the USPTO.
3. The signal generating device according to claim 2, wherein the digital signal processing unit includes at least either a main nonlinear filter that is connected to an input side of the means for generating the original divided signals or M sub nonlinear filters that are respectively connected to M outputs of the 2M×M filter.
5. The signal generating device according to claim 4, wherein the broadband analog signal generating unit is an IQ modulator circuit that is constituted by two mixers, a combiner, and a 90-degree phase shifter.
6. The signal generating device according to claim 5, wherein the digital signal processing unit includes at least either a main nonlinear filter that is connected to an input side of the means for generating the original divided signals or M sub nonlinear filters that are respectively connected to M outputs of the 2M×M filter.
7. The signal generating device according to claim 4, wherein the digital signal processing unit includes at least either a main nonlinear filter that is connected to an input side of the means for generating the original divided signals or M sub nonlinear filters that are respectively connected to M outputs of the 2M×M filter.
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June 24, 2019
September 6, 2022
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